WST Upgrades?

Are there any upgrades for WST Megatron? I've noticed that there is an add-on kit for the MP05 Megatron, but is there a similar kit for WST Megatron? Parts I'm looking for would be the barrel extension piece, or silencer, and the arm grip thingy. Sorry for my bad terminology, I don't know the official name of the piece that attaches to the handle of the gun to help steady it.

But are they available for WST Megatron? I've just purchased one and would like to upgrade it some time.

Okay, just tracked down my WST Megatron and it look's like he's floating around town on the USPS truck. So, I have a few questions.
What should I look out for when transforming WST Megatron?

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1. Breaking it.
2. The arms can be very fiddly and can come apart. As long as you've got a magnifying glass handy and a pair of small hands near, you should be able to fix them. I've had that problem with mine several times.

Thanks guys! I actually got him yesterday and had no troubles at all transforming him. Except his center piece "chest" doesn't line up perfectly in bot-mode, and his right arm won't go in evenly due to his barrel. Other than that, perfection!